In electronics a NOT gate is more commonly called an inverter. The circle on the symbol is called a bubble, and is used in logic diagrams to indicate a logic negation between the external logic state and the internal logic state (1 to 0 or vice versa).
A weather watch, on the other hand, typically refers to an alert issued to indicate that conditions are favorable for the development of dangerous weather patterns, although the dangerous weather conditions themselves are not currently present.
Winter Storm or Blizzard Watch. A winter storm watch is issued when wintry weather conditions are expected in the next 12 to 48 hours. This watch can be upgraded to a blizzard watch when snow and wind gusts of at least 35 mph will drop visibility to less than a quarter mile for three hours or longer.To stay safe during this winter storm situation it is important that the necessary precautions are taken prior to the storm's arrival.his watch can be upgraded to a blizzard watch when snow and wind gusts of at least 35 mph will drop visibility to less than a quarter mile for three hours or longer. To stay safe during this winter storm situation it is important that the necessary precautions are taken prior to the storm's arrival.